● Mounting parts: Air filter replacement

It's been half a year since the last replacement, and since Minyu gave me an external muffler (unlike Exe-san, Sumimasen!), I replaced the air filter again.
When using a normal muffler, I could hear a small "shoe" and intake noise, but when using an external muffler, I couldn't hear it anymore (sorry!).

Photo A is a normal shot, but Photo B is seen through the light.It is no wonder that the inhalation efficiency is high if it is so transparent.
When running on a dusty site, I think about the engine and use a thin non-woven fabric as before.
Is this the end of tuning the inlet and outlet (intake and exhaust)?

● Kyoto Prefecture geopre (Axela / BM Gasoline 1.5L)